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Figure 14 presents data on sodium ion concentrations in <br />water samples from the study area. The distribution follows in <br />large part the conductivity data. Sodium is the leading cation <br />in some waters while calcium is the leading cation in others. In <br />general ground waters had higher Na+, while surface water had <br />higher Cat+. This most likely is due to increased evaporation <br />from groundwater which allows sodium to accumulate. <br />ESCALANTE STATE WILDLIFE AREA ON THE GUNNISON RIVER <br />~-- N <br />old rive <br />1, o0o rest <br />s. <br />Sodium concentrations mg/L <br />in surface and ground water <br />irrigation return <br />river channel ~ bodcwater <br />96 1260 <br />1080 g <br />210 11 <br />.~' irrigation return <br />5 4 <br />Gumison fiver irrigation return <br />91.2 <br />190 <br />53 <br />bockw""crier 54.6 ~ O r"1 <br />1180 ~Pands ~/ <br />escarpment '--- <br />Roubideou Creek <br />Figure 14. Sodium ion concentrations (mg L-1) in surface and <br />ground waters in the study area.. <br />21 <br />